Sea level anomalies in the northwestern Pacific during 2011 associated with La Ni&#241;a and negative Indian Ocean Dipole

Qiu Fuwen; Qiu Yun; Pan Aijun; Cha Jing; Zhang Shanwu

doi:10.1007/s13131-019-1499-y

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Article Navigation > Acta Oceanologica Sinica > 2019 > 38(11): 62-69

Qiu Fuwen, Qiu Yun, Pan Aijun, Cha Jing, Zhang Shanwu. Sea level anomalies in the northwestern Pacific during 2011 associated with La Niña and negative Indian Ocean Dipole[J]. Acta Oceanologica Sinica, 2019, 38(11): 62-69. doi: 10.1007/s13131-019-1499-y

Citation:

Qiu Fuwen, Qiu Yun, Pan Aijun, Cha Jing, Zhang Shanwu. Sea level anomalies in the northwestern Pacific during 2011 associated with La Niña and negative Indian Ocean Dipole[J]. Acta Oceanologica Sinica, 2019, 38(11): 62-69. doi: 10.1007/s13131-019-1499-y

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Sea level anomalies in the northwestern Pacific during 2011 associated with La Niña and negative Indian Ocean Dipole

doi: 10.1007/s13131-019-1499-y

1.
Third Institute of Oceanography, Ministry of Natural Resources, Xiamen 361005, China
2.
Third Institute of Oceanography, Ministry of Natural Resources, Xiamen 361005, China;Laboratory for Regional Oceanography and Numerical Modeling, Pilot National Laboratory for Marine Science and Technology (Qingdao), Qingdao 266237, China

Received Date: 2018-07-17

Abstract

Abstract

The sea level anomalies (SLAs) pattern in the northwestern Pacific delineated significant differences between La Niña events occurring with and without negative Indian Ocean Dipole (IOD) events. During the pure La Niña events, positive the sea surface level anomalies (SLAs) appear in the northwestern Pacific, but SLAs are weakened and negative SLAs appear in the northwestern Pacific under the contribution of the negative IOD events in 2010/2011. The negative IOD events can trigger significant westerly wind anomalies in the western tropical Pacific, which lead to the breakdown of the pronounced positive SLAs in the northwestern Pacific. Meanwhile, negative SLAs excited by the positive wind stress curl near the dateline propagated westward in the form of Rossby waves until it approached the western Pacific boundary in mid-2011, which maintained and enhanced the negative phase of SLAs in the northwestern Pacific and eventually, it could significantly influence the bifurcation and transport of the North Equatorial Current (NEC).
- sea level anomalies|La Niña|negative IOD|northwestern Pacific

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